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An Oncogenic Hepatocyte-Induced Orthotopic Mouse Model of Hepatocellular Cancer Arising in the Setting of Hepatic Inflammation and Fibrosis
Published on: September 12, 2019
A lymphotoxin-driven pathway to hepatocellular carcinoma
Johannes Haybaeck1, Nicolas Zeller, Monika Julia Wolf
1Department of Pathology, University Hospital Zurich, CH 8091 Zurich, Switzerland.
Cancer Cell
|October 6, 2009
Summary
Hepatitis B and C viruses (HBV and HCV) cause liver cancer through poorly understood mechanisms. This study reveals that lymphotoxin (LT) signaling promotes hepatitis and hepatocellular carcinoma (HCC) development.
Area of Science:
- Hepatology
- Immunology
- Oncology
Background:
- Hepatitis B and C viruses (HBV and HCV) are major causes of chronic hepatitis and hepatocellular carcinoma (HCC).
- The precise molecular mechanisms underlying HBV/HCV-induced HCC remain incompletely understood.
- Cytokine signaling pathways are implicated in liver disease pathogenesis.
Purpose of the Study:
- To investigate the role of lymphotoxin (LT) cytokines and their receptor (LTbetaR) in HBV/HCV-induced hepatitis and HCC.
- To establish a causal link between hepatic LT overexpression and the development of liver inflammation and HCC.
- To identify key molecular players and signaling pathways involved in hepatitis-induced HCC.
Main Methods:
- Analysis of cytokine and receptor expression in HBV/HCV-infected liver tissues.
- Generation of transgenic mice with liver-specific expression of LTalpha and LTbeta.
- Assessment of liver inflammation, HCC development, and cellular composition in mouse models.
- Investigation of the dependence on lymphocytes, IKappa B kinase beta, and TNFR1 in HCC development.
- In vivo stimulation and inhibition of LTbetaR signaling.
Main Results:
- Lymphotoxin (LT) alpha and beta, along with their receptor (LTbetaR), are upregulated in HBV/HCV-induced hepatitis and HCC.
- Liver-specific expression of LTalpha/beta in mice leads to liver inflammation and HCC, establishing a causal link.
- HCC development in this model involves A6(+) oval cells and depends on lymphocytes and hepatocyte-expressed IKappa B kinase beta, but not TNFR1.
- Hepatocytes are identified as the primary LT-responsive liver cells upon in vivo LTbetaR stimulation.
- Inhibition of LTbetaR signaling in LTalpha/beta-transgenic mice with hepatitis significantly suppresses HCC formation.
Conclusions:
- Sustained lymphotoxin (LT) signaling is a critical pathway implicated in the pathogenesis of hepatitis-induced hepatocellular carcinoma (HCC).
- Targeting the LT signaling pathway may offer a therapeutic strategy for preventing or treating HCC in the context of chronic viral hepatitis.
- The study highlights the complex interplay between immune signaling and liver cell intrinsic pathways in driving HCC development.
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